JPH10101074A - Method for applying sealing agent to roll part of non-circular can lid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily dry the sealing material applied to a rolled part of a non- circular can lid at a low cost. SOLUTION: In a method where a non-circular can lid 11 is supported in a standstill condition, the sealing material is sprayed on a rolled part 13 by a sealing material spray nozzle 15 moving along the rolled part 13 immediately above the seamed part of a circumferential edge of the non-circular can lid 11, and then, the sealing material is dried, the sealing material with large ratio of the solid part is applied in a projected manner on the rolled part 13 by the sealing spray nozzle 15, and the high pressure gas is sprayed on the sealing material to orient the sealing material applied in a projected manner in a strip shape over the whole surface of the rolled part 13, and then, the sealing material is dried at low temperature in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for applying a sealing material to a tightened portion of a non-circular can lid, and more particularly, to a method for applying a sealing material to an end of a non-circular can body made of a thin metal plate. The present invention relates to a method and an apparatus for applying a sealing material to a non-circular can lid peripherally-sealed tightening portion before the tightening step in order to ensure airtightness of the non-circular can lid made of a metal sheet to be wound. Things. In the present specification including the claims, the term "sealing material" refers to a rubber-containing sealing compound or a material containing an adhesive or an adhesive applied to a tightly-sealed portion of a can lid in order to secure its airtightness. Shall be referred to. “Non-circular” includes a substantially square, a substantially rectangular, a substantially elliptical shape, and the like.

[0002]

2. Description of the Related Art The operation of applying a sealing material to a tightened portion of a non-circular can lid is generally performed by a lining machine. That is, in the conventional lining machine,
As shown in FIG. 4, the non-circular can lid 1 is supported in a stationary state, and sealing is performed by the sealing material injection nozzle 5 that moves along the winding part 3 immediately above the winding part 3 around the periphery of the non-circular can lid 1. The material 7 is sprayed on the winding portion 3. In this case, a highly fluid sealing material 7 is used in order to spread the sealing material 7 injected by the sealing material injection nozzle 5 over the entire surface including the curled edge 3a of the tightening portion 3. That is, the sealing material 7 having a solid content of 40% or less and a water content of 50% or more is generally used. After the sealing material 7 is applied to the winding portion 3 around the periphery of the non-circular can lid 1 in this manner, in the drying step 9, the non-circular can lid 1 is placed in a hot air atmosphere of about 60 to 80 ° C. for about 10 to 15 minutes. Let it stay. As described above, the non-circular can lid 1
A sealing coating film 7 ′ is formed on the peripheral tightening portion 3.

[0003]

As described above, in the prior art, in order to spread the sealing material injected by the sealing material injection nozzle over the entire surface including the curled edge in the wound portion, a high fluidity is required. A sealing material having a solid content of 40% or less and a water content of 50% or more is used. As a result, in the drying step, in order to evaporate a large amount of water contained in the sealing material applied to the wrapped portion of the non-circular can lid, the non-circular can lid is removed by about 60 to 8
It is required to stay in a hot air atmosphere at a high temperature of 0 ° C. for a long time of about 10 to 15 minutes. Therefore, a large-scale drying apparatus that consumes a large amount of fuel is required in the drying step, and the cost increase in the drying step cannot be avoided. Also, delicate control of the drying process is required. By the way, if the non-circular can lid is kept in a high-temperature hot air atmosphere to shorten the drying process,
Often, a dry skin is formed on the surface of the sealing material applied to the tightened portion, and when the sealing material is further heated after the formation of the dry skin, moisture remaining inside the sealing material is turned into steam. The so-called blowhole phenomenon that ruptures the dried epidermis may occur.
Such a blowhole phenomenon causes a product defect. The present invention solves the above-mentioned problems in the prior art, and secures a preferable sealing effect by spreading a sealing material applied to a tightened portion of a non-circular can lid in a belt shape over the entire surface of the tightened portion. In addition, the sealing material applied to the wound portion of the non-circular can lid is to be dried easily and at low cost.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a method and an apparatus for applying a sealing material to a tightened portion of the following non-circular can lid.

(1) The non-circular can lid is supported in a stationary state,
A method in which a sealing material is jetted onto the winding portion by a sealing material injection nozzle that moves along the winding portion directly above the winding portion on the periphery of the non-circular can lid, and then the sealing material is dried. A sealing material having a large solid content ratio is applied to the wound portion by the sealing material injection nozzle in a ridge shape, and the sealing material applied in the ridge shape by injecting high-pressure gas to the sealing material. Wherein the sealing material is dried in a short time at a low temperature after spreading the entire surface of the winding portion in a belt shape, wherein the sealing material is applied to the winding portion of the non-circular can lid. (Claim 1).

(2) In the vicinity of the feeding device which intermittently feeds the non-circular can lid, when the non-circular can lid is in a stationary state, the portion just above the peripheral portion of the periphery of the non-circular can lid is used as the winding portion. A sealing material spray nozzle for applying a sealing material having a large solid content ratio on the winding portion while projecting along the sealing portion, and the sealing material spray nozzle in the vicinity of the feeding device behind the sealing material spray nozzle. A high-pressure gas injection nozzle is provided which injects a high-pressure gas to the sealing material when the circular can lid is in a stationary state so that the sealing material applied in the form of a ridge is spread in a band shape over the entire surface of the wound portion. An apparatus for applying a sealing material to a wound portion of a non-circular can lid, wherein the sealing material is provided (claim 2).

[0007]

[Action]

[Method of Claim 1] In the method of Claim 1, a high-viscosity sealing material having a large ratio of the solid content is applied in a ridge-like shape on the wound portion by a sealing material injection nozzle. The high-viscosity sealing material applied in the form of a ridge on the wrapped portion does not spread over the entire surface of the wrapped portion as it is, and does not exhibit a sufficient sealing effect. It takes a long time for the water to evaporate. According to the method of the first aspect, after the application, the sealing material applied in the form of a ridge is spread in a belt shape over the entire surface of the wound portion by spraying a high-pressure gas to the sealing material. ing. By spreading the sealing material in a belt shape over the entire surface of the wound portion, the sealing effect of the wound portion can be enhanced. In addition, since the sealing material used is a high-viscosity material having a high solid content ratio and a low water content from the beginning, the applied sealing material is spread in a belt shape, The obtained sealing material can be dried at a low temperature of about room temperature and in a short time. As described above, when the sealing material is a rubber-containing sealing compound, an elastic coating film is formed on the tightened portion of the periphery of the non-circular can lid,
In the case where the sealing material is an adhesive or a material containing an adhesive, an adhesive coating film is formed on the tightened portion around the periphery of the non-circular can lid.

[0008] In the apparatus according to the second aspect, the non-circular can lid is intermittently fed by the feeding device.
A sealing material injection nozzle disposed near the feeding device applies a high-viscosity sealing material having a high solid content ratio on the winding portion of the non-circular can lid in a ridge shape. The high-viscosity sealing material applied in the form of a ridge on the wrapped portion does not spread over the entire surface of the wrapped portion as it is, and does not exhibit a sufficient sealing effect. It takes a long time for the water to evaporate. Thus, in the apparatus of claim 2, the non-circular can lid on which the application of the sealing material has been completed is further fed by the feeding device,
The sealing material applied in the form of a ridge is spread in a belt shape over the entire surface of the wound portion by the high-pressure gas injected by the high-pressure gas injection nozzle. By spreading the sealing material in a belt shape over the entire surface of the wound portion, the sealing effect of the wound portion can be enhanced. Subsequently, the sealing material spread in a belt shape over the entire surface of the wound portion is appropriately dried. This drying operation may be performed with the non-circular can lid attached to the feeding device (see FIG. 1), or may be performed with the non-circular can lid removed from the feeding device. The sealing material used is of a high viscosity having a large solid content ratio and has a low water content from the beginning, so that the applied sealing material is stretched in a band shape, and the sealing material is applied. The sealing material can be dried at a low temperature of about room temperature and in a short time. As described above, when the sealing material is a rubber-containing sealing compound, an elastic coating film is formed on the tightened portion of the periphery of the non-circular can lid, and when the sealing material is an adhesive or a material containing an adhesive, a non-circular can is used. An adhesive coating is formed on the tightened portion around the periphery of the circular can lid.

[0009]

Next, embodiments of the present invention will be described with reference to the accompanying drawings.

First, a method for applying a sealing material to a tightened portion of a non-circular can lid will be described. In the method according to the present invention, the non-circular can lid 11 is supported in a stationary state, and the non-circular can lid 11 is placed just above the cinching portion 13 around the periphery of the non-circular can lid 11.
After the sealing material 17 is sprayed onto the tightened portion 13 by the sealing material spraying nozzle 15 moving along 3,
In that the sealing material 17 is dried,
It is the same as the conventional method.

Thus, in the method according to the present invention, the sealing material spray nozzle 15 applies a high-viscosity sealing material 17 having a large solid content ratio onto the winding portion 13 in a ridge shape. The sealing material 17 has a very low fluidity and a high viscosity, for example, having a solid content of 70% or more. By injecting a high-pressure gas such as compressed air or the like to the sealing material 17, the sealing material 17 applied in the form of a ridge is spread in a belt shape over the entire surface including the curled edge 13a of the wrapped portion 13. Subsequently, the sealing material 17 is dried at a low temperature of about room temperature in the factory and in a short time. Reference numeral 19 in FIGS. 1 and 3 denotes a drying step.

Next, a description will be given of an apparatus for performing the above-described method of applying a sealing material to the tightened portion of the non-circular can lid. Reference numeral 21 denotes a feeding device for intermittently feeding the non-circular can lid 11. In the vicinity of the feeding device 21, when the non-circular can lid 11 is at rest,
A sealing material spraying in which a high-viscosity sealing material 17 having a large solid content ratio is applied on the winding portion 13 in a ridge shape while moving along the winding portion 13 directly above the winding portion 13 on one peripheral edge. A nozzle 15 is provided. Reference numeral 23 denotes a sealing material supply pipe for supplying the sealing material 17 to the sealing material injection nozzle 15, and reference numeral 25 denotes a support member of the sealing material injection nozzle 15. Behind the sealing material injection nozzle 15 in the vicinity of the feeding device 21, the non-circular can lid 11 is applied to the sealing material 17 by spraying a high-pressure gas such as compressed air onto the sealing material 17 when the lid 11 is at rest. The sealing material 17 that has been
A high-pressure gas injection nozzle 27 that extends in a belt shape over the entire surface including the curled edge 13a is disposed. Reference numeral 29 denotes a high-pressure gas supply pipe for supplying a high-pressure gas such as compressed air to the high-pressure gas injection nozzle 27. Subsequently, the sealing material 17 is dried at a low temperature of about room temperature in the factory and in a short time.

[0013] When a sealing material is applied to the wound portion of a circular can lid of a circular can such as a beer can, a high-viscosity sealing material having a large solid content ratio is generally used. However, in this case, the circular can lid is
It is rotated at a high speed of about 0 to 2,000 revolutions / minute, and a sealing material is sprayed on the wrapped portion by a sealing material injection nozzle which is stationary just above the wrapped portion on the periphery of the circular can lid. The sealing material is spread outward by centrifugal force. In the case of the non-circular can lid according to the present invention, the non-circular can lid is rotated at a high speed, and the sealing material is sprayed onto the tightly wound portion by a stationary sealing material injection nozzle, and the sealing material is centrifugally applied. Because it is impossible to spread outwardly, the sealing material applied in the form of a ridge on the stationary tightening portion as described above is spread in a belt shape over the entire surface of the tightening portion by high-pressure gas. It is.

[0014]

As described above, according to the present invention, a high-viscosity sealing material having a large solid content ratio is applied in a ridge shape on the wound portion by the sealing material injection nozzle. By injecting a high-pressure gas, the sealing material applied in the form of a ridge is spread in a belt shape over the entire surface of the wound portion. By spreading the sealing material in a belt shape over the entire surface of the wound portion, the sealing effect of the wound portion can be enhanced. In addition, since the sealing material used is a high-viscosity material having a high solid content ratio and a low water content from the beginning, the applied sealing material is spread in a belt shape, The obtained sealing material can be dried at a low temperature of about room temperature and in a short time. Therefore, it is possible to significantly reduce costs in the drying process. Further, the drying step becomes extremely easy, and the occurrence of the blowhole phenomenon is prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a method and an apparatus according to the present invention.

FIG. 2 is a sectional view showing an example of a non-circular can lid.

FIG. 3 is an explanatory view schematically showing a method and an apparatus according to the present invention.

FIG. 4 is an explanatory view schematically showing a conventional method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Non-circular can lid 3 Winding part 3a Curled edge 5 Sealing material injection nozzle 7 Sealing material 7 'Sealing film 11 Non-circular can lid 13 Winding part 13a Curled edge 15 Sealing material injection nozzle 17 Sealing material 19 Drying process 21 Feeding device 23 Sealing material supply pipe 25 Support member 27 High pressure gas injection nozzle 29 High pressure gas supply pipe

Claims (2)

[Claims] 1. A non-circular can lid is supported in a stationary state, and a sealing material is sprayed on a sealing material jet nozzle just above a winding portion at a peripheral edge of the non-circular can lid along the sealing portion. After spraying, in a method in which the sealing material is dried, the sealing material spray nozzle applies a sealing material having a large solid content ratio on the wound portion in a ridge shape, and applies a high pressure to the sealing material. After expanding the sealing material applied in the form of a ridge over the entire surface of the wound portion by spraying a gas,
A method for applying a sealing material to a tightened portion of a non-circular can lid, wherein the sealing material is dried at a low temperature in a short time. 2. In the vicinity of the feeding device for intermittently feeding the non-circular can lid, the non-circular can lid is located just above the non-circular can lid at a position just above the periphery of the non-circular can lid along the winding portion. A sealing material injection nozzle for applying a sealing material having a large solid content ratio on the winding portion in a ridge shape while moving, and the non-circular shape is provided behind the sealing material injection nozzle in the vicinity of a feeding device. A high-pressure gas injection nozzle is provided which injects a high-pressure gas to the sealing material when the can lid is in a stationary state so that the sealing material applied in the form of a ridge is spread in a band shape over the entire surface of the wound portion. An apparatus for applying a sealing material to a tightened portion of a non-circular can lid.